Summary statistics for acc_aux dataset : by Jean Roth , jroth@nber.org , 22 Oct 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- year | 30,056 2014 0 2014 2014 state | 30,056 27.86954 16.29278 1 56 st_case | 30,056 279348.4 162897.2 10001 560131 county | 30,056 92.73433 96.58878 0 820 fatals | 30,056 1.089433 .3649784 1 10 -------------+--------------------------------------------------------- a_crainj | 30,056 1 0 1 1 a_region | 30,056 5.336006 2.347598 1 10 a_ru | 30,056 1.49847 .5022634 1 3 a_inter | 30,056 1.887577 .3415993 1 3 a_relrd | 30,056 2.186119 1.436817 1 6 -------------+--------------------------------------------------------- a_intsec | 30,056 1.766503 .4293087 1 3 a_roadfc | 30,056 3.885015 1.583716 1 7 a_junc | 30,056 1.846487 .5482444 1 4 a_mancol | 30,056 1.923343 1.337796 1 7 a_tod | 30,056 1.524654 .513978 1 3 -------------+--------------------------------------------------------- a_dow | 30,056 1.419018 .4969677 1 3 a_ct | 30,056 1.468126 .6151058 1 3 a_lt | 30,056 1.885913 .3179222 1 2 a_mc | 30,056 1.84988 .3571947 1 2 a_spcra | 30,056 1.724215 .4469165 1 2 -------------+--------------------------------------------------------- a_ped | 30,056 1.837537 .3688815 1 2 a_ped_f | 30,056 1.839001 .3675366 1 2 a_pedal | 30,056 1.975679 .1540472 1 2 a_pedal_f | 30,056 1.975779 .1537386 1 2 a_roll | 30,056 1.751298 .4322681 1 2 -------------+--------------------------------------------------------- a_polpur | 30,056 1.989154 .1035815 1 2 a_posbac | 30,056 2.254392 .8359125 1 3 a_d15_19 | 30,056 1.905909 .2919602 1 2 a_d16_19 | 30,056 1.908537 .2882706 1 2 a_d15_20 | 30,056 1.8748 .3309506 1 2 -------------+--------------------------------------------------------- a_d16_20 | 30,056 1.877396 .3279881 1 2 a_d65pls | 30,056 1.814546 .3886717 1 2 a_d21_24 | 30,056 1.851078 .3560175 1 2 a_d16_24 | 30,056 1.736026 .4407926 1 2 a_rd | 30,056 1.464001 .4987107 1 2 -------------+--------------------------------------------------------- a_hr | 30,056 1.949162 .2196713 1 2 a_dist | 30,056 1.901118 .2985086 1 2 a_drowsy | 30,056 1.975146 .1556814 1 2 by Jean Roth , jroth@nber.org , 22 Oct 2016